Are you overrun with mosquitos? The Mosquito Magnet is a pricey device that lures blood-sucking critters into its net by sending out a plume of carbon dioxide like we and other yummy animals do. It runs off a propane tank just like a gas grill. You’d think that mosquitos would be better off not causing irritation, not to mention spreading diseases, when they take our blood. What is the evolutionary advantage of being targeted for a slap? I suppose they’re just fast enough and prolific enough (one female lays 100-300 eggs at a time) that it didn’t matter.